Project: Weather Video Sat 4/2/04 Mesa State College, Grand Junction.
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Transcript of Project: Weather Video Sat 4/2/04 Mesa State College, Grand Junction.
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Project:Weather Video Sat
4/2/04
Mesa State College, Grand Junction
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•Produce a full length, high quality video.
•Record humidity, pressure, and temperature during entire flight.
Purpose of the Weather Video Sat
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Achieving the Goal.
Project Management
Structura l D esign:Box and m ounts
Pressure H um id ity Tem perature
W eather V ideo H eaters
Pow er Board
E lectronics
Sate llite P ro ject
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Power Board
•www.national.com •Design tab•WebBench•Power, Amplifiers, or wireless designs.•Includes parts and printed board in a kit.•Solder and you’re done.
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Box Design Considerations•Tough & light
•Protection of components•Modular design
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Strong and light• Fiberglass reinforced, 3/16” foam core board
– From local hobby shop– Insulation, inexpensive, rigid and
strength/weight• ¼” PVC tubing
– Strong, easily accessible, inexpensive– Easy to work with
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Protection of Components
• Weather sensors nestled inside structural PVC tubing– Prevents damage during flight while still
outside box• Camera entirely inside box
– Viewing window
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Modular Design• If 1 sub-system fails, others will continue• Provide easy access to components
– Last minute modifications/adjustments• Provide adaptability for add-ons• Standardize connections
– Allow for removal of component boards
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Heater Design Considerations• Modifiable and adaptable
– Thermistor/resistor is detached from board but attached to formed aluminum diffuser
• Easily manufactured• Efficiently heat components
– Using microcontroller to pulse heat on/off to achieve desired temperature
• Minimize parts– Lessen chance for hardware failure
– Uses only well-tested components
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Weather Sensing
• Temperature
• Relative Humidity
• Barometric Pressure (Absolute)
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Design Considerations• Using external A/D converters and digital port
expanders.– Adds redundancy for acquiring data as well as a more
robust system overall.
• Using Dallas 1-wire products.– Simple yet powerful protocol to use and implement.– Digital lines are less susceptible to interference
• Mounting sensors internally – Temperatures will reach far below specifications for R.H
and Absolute Pressure
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Basic System Overview
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•Project Description•Be able to record 3 hours of high quality video.
Video Systems
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Camera and Features
• Panasonic SV-AV30– Main Features:
• Remote Control
• Static Focus
• Light Weight < 2 oz.
• Mpeg 4 Format
3D View of SV-AV30
Full list of features list at Panasonic
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MPEG Format Recording Times
Data provided at: http://www.panasonic.com/consumer_electronics/d_snap/images/capacitychart.gif
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Control System
• Microchip PIC12F675 – 8 pin chip
– Very small
– Low current draw
– 6 I/O pins available
– Full specs available on Microchip’s website PIC12F675
– Summarize circuit diagram
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Optics
• Static mirroring system– Fewer moving parts.
– Kill Murphy, less to go wrong.
– Lighter.
– Less current wasted.
– Capable of viewing in more than one direction at a time.
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Thermal Management
• Insulated box– Will contain the 2 watts of
heat generated by the camera.
– Possible PWM heating.
– Heating element needed to avoid condensation on lens.
– Camera is enclosed to heat minimum amount of space.
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•Camera under 0.3kg.
•Circuit boards together 0.3kg. est.
•Box 0.5kg. est.
•We are expecting to come in well under 1.5 kg. limit.
Mass Budget
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•Total budget is $1500 for the project.
•Camera was approximately $350.
•Estimated $400 in other circuit boards, parts, and the box itself.
Price Budget
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•Expect to be testing by June 1st.
•Finished product by August 1st.
Project Schedule
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•High quality digital film.
•Repeated weather records.
•More innovative ideas.
NASA Benefits
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Questions or Comments?